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Proceedings Paper

Testing spherical expanding line-blanketed model atmospheres of giant stars with interferometry
Author(s): Jason P. Aufdenberg; Peter Hasche Hauschildt
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Paper Abstract

We show examples of PHOENIX stellar atmosphere model simulations for data obtained by long-baseline optical interferometers. A single spherical, hydrostatic model atmosphere for the M-type giant star γ Sagittae is shown to be in good agreement with interferometric, spectrophotometric, and high-dispersion spectroscopic data sets. In particular we show that the interferometric triple products and wavelength-dependent uniform disk diameters measured by the Navy Prototype Optical Interferometer (NPOI) are well matched by our model. With expanding atmosphere models for the A-type supergiant α Cygni we predict that the center-to-limb intensity profile is sensitive to the mass-loss rate of its stellar wind. For one possible NPOI configuration we show the sensitivity of the squared visibility amplitudes to the model mass-loss rate at spatial frequencies beyond the first null. The importance of hot star photospheric interferometry is discussed.

Paper Details

Date Published: 21 February 2003
PDF: 9 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459757
Show Author Affiliations
Jason P. Aufdenberg, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter Hasche Hauschildt, Univ. of Georgia (United States)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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